From owner-freebsd-ipfw@freebsd.org  Thu Aug 13 14:23:38 2015
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Date: Fri, 14 Aug 2015 00:00:51 +1000 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Julian Elischer <julian@freebsd.org>
cc: "Alexander V. Chernikov" <melifaro@ipfw.ru>,
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Subject: Re: ipfw delete 100-300
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On Thu, 13 Aug 2015 12:24:31 +0800, Julian Elischer wrote:
 > BTW, any ideas as to what causes this?
 > # ipfw show
 > [...]
 > 00400      0                    0 deny ip from 10.12.1.0/24 to any in recv
 > xn0
 > 00500      0 16045693110842147038 deny ip from 204.109.63.0/25 to any in recv
 > xn1
 > 00600      0                    0 allow ip from any to any in recv xn1
 > [...]
 > 65535   8251 16045693110842147290 deny ip from any to any
 > 
 > 
 > -current as of the 5th of august
 > FreeBSD vps1.elischer.org 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r286304: Wed
 > Aug  5 14:31:10 PDT 2015
 > root@vps1.elischer.org:/usr/obj/usr/src-current/sys/VPS1  i386
 > 
 > note i386, not amd64.

Assuming all digits were shown, on a wild hunch:

t23% echo 'scale=20; 2^64 - 16045693110842147038' | bc
2401050962867404578
t23% echo 'scale=20; 2^63 - 16045693110842147038' | bc
-6822321073987371230

Wrongly (un?)signed int64?  Either way, a lot of bytes for 0 packets :)

cheers, Ian